Here's how to get rid of them.
When I first saw them I thought it's a pretty good idea, saving you the clicks to follow links and I added SLP to my blog but I also soon got tired of seeing the preview window popup on blogs everywhere and removed the code from my blog yesterday.
I think it was Scott Watermasysk that said with SPA we're one step away from scrolling neon marquees like web in the 90s :)
While I don't think it's that bad and useful in some instances it's something that should rather be enabled by the end-user, maybe as a browser plugin, should he/she want the functionality.